Getting Set Up

Over the course of this training, you'll solve challenges that use real hardware and software. Before each challenge, you'll want to take a moment to set up your host PC and GreatFET devices.

Most challenges will include one or more types of binaries or python scripts:

Ensuring you're on the latest verisons

The live USB image provied with the course ships with copies of each of the open-source projects used in the course. Before you being, run the following commands to ensure you have the latest versions:

# Update the GreatFET repo
cd ~/greatfet; git pull

# Update the FaceDancer repo
cd ~/facedancer; git pull

# Update the Course Materials repo
cd ~/usb-course-materials; git pull

Loading a GreatFET Binary

The easiest way to load GreatFET Target binaries is using the greatfet firmware tool (gf fw for short). To keep things simple, we'll load from Device Firmware Update (DFU) mode -- which works no matter the state of your GreatFET and makes selecting which GreatFET you're working with easy.

The top button on the GreatFET is its reset button; the bottom is its DFU button.

Entering DFU mode is simple:

  1. Press and hold the DFU button on your GreatFET.
  2. Without releasing the DFU button, press and release the RESET button.
  3. Release the DFU button. Your GreatFET should not have any illuminated LEDs, and should show up as a NXP Semiconductors LPC, 1fc9:000C.

Once the device is in DFU mode, you can load a GreatFET binary with the following command:

greatfet firmware -d -w <bin_filename>

or, for short:

gf fw -dw <bin_filename>

For example, if your binary was called single_packet_analysis.bin, you could load and run it with the following command:

greatfet firmware -d -w single_packet_analysis.bin

You can use the same process to restore the default GreatFET firmware. An appropriate version of the GreatFET firmware is built into the host tools distribution. You can restore the original firmware at any time by running the following command with the GreatFET in DFU mode:

greatfet firmware -d --autoflash

Running a Host Binary

Host binaries are designed to run from the training's live environment or docker image, but will likely run on any modern Linux machine. You can run these binaries in the same way you'd run any other Linux script or binary. To run a program called host_communication, you'd simply run the binary from the Linux command line: